Extracting of Remote Sensing Information of Wetland in Nansihu Area Based on Multi-subarea and Multi-layer Techniques

Taking the Nansihu Lake Area as the study case and using TM image data,pose the extracting technique of wetland information by combination of multi-subarea and multi-layer on the basis of systemic analysis of spectrum character of all wetland types.Firstly,compartmentalize this research area into two sub-areas according to the distribution of every type in this area.Then,make multi-layer extracting in the light of wetland spectrum character in the sub-areas,using the techniques of TM4 band threshold,modeling and improved supervision classification.